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Evaluate
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Differentiate w.r.t. p
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4p^{-1}\times 5
To multiply powers of the same base, add their exponents. Add 3 and -4 to get -1.
20p^{-1}
Multiply 4 and 5 to get 20.
\frac{\mathrm{d}}{\mathrm{d}p}(4p^{-1}\times 5)
To multiply powers of the same base, add their exponents. Add 3 and -4 to get -1.
\frac{\mathrm{d}}{\mathrm{d}p}(20p^{-1})
Multiply 4 and 5 to get 20.
-20p^{-1-1}
The derivative of ax^{n} is nax^{n-1}.
-20p^{-2}
Subtract 1 from -1.